JPH04202042A - Production of marbled pottery product - Google Patents

Abstract

PURPOSE:To stably obtain a marbled pottery product by adding a viscosity regulating agent to both of slip for ground coat glaze and slip for cover coat glaze, further adding a surfactant to one of them, putting the cover coat glaze before drying the ground coat glaze put on body and calcining the body. CONSTITUTION:A viscosity regulating agent such as NaCl, Na2CO3 or acetic acid is added to rubber, gelatin, CMC, sodium alginate, bentonite, etc., to prepare slip for ground coat glaze and slip for cover coat glaze, and a surfactant such as sulfuric ester of higher alcohol or alkylbenzenesulfonate is added to one of them. The ground coat glaze is put on body, the cover coat glaze having the same color as the ground coat glaze or assuming black is further put on the ground coat glaze before drying and the body is calcined to obtain a marbled pottery product.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method of applying a glaze to the surface of a ceramic base.
The present invention relates to a method of manufacturing ceramic products having a marble pattern.

[Prior Art] Methods for decorating ceramic products with glazes, especially for creating natural stone patterns such as natural stone patterns, include (L), a method for obtaining a natural continuous pattern by utilizing the melt viscosity of flj powder; (2) A method of obtaining a natural continuous pattern by applying translucent glaze, transparent glaze, or glaze of different brightness multiple times has been proposed to date, but no commercial production has been carried out.

[Problem to be Solved by the Invention] All of the above-mentioned methods are intended to create a pattern through a firing process, and the form of the pattern must depend on the firing conditions. However, the melt viscosity of the glaze is greatly affected by the firing temperature, and the transparency is also greatly affected by the firing temperature and the cooling process.

As described above, the above-mentioned method requires sufficient control of the firing conditions in order to create a pattern (7), and the current situation is that it has not been able to be popularized in terms of numbers.

Due to the current situation described above, there has been a desire in the glaze industry for a method to produce stable patterns that are not affected by firing conditions.

[Means for Solving the Problem] It is generally known that depending on the viscosity of the glaze slip, various states of molten droplets will be formed when the bolt is dropped onto the substrate.

The inventor of the present invention paid attention to this point,7 and developed the technology further, and succeeded in obtaining a specific pattern. That is, by controlling the viscosity and diffusivity of each glaze slip in a multilayer glazing method using a plurality of glazes, it is possible to obtain a marble pattern with the glaze.

FIG. 1 is a diagram schematically showing the progress of patterning of a glaze according to the present invention, and FIG. 2 is a cross-sectional view of FIG. 1. In Figures 1 and 2, reference numbers
1 is the base material, 2 is the lower glaze, 3 is the molten drop, in the figure (a,
The arrows between ), (b) and (c) indicate the change over time in which the molten droplets of the upper glaze diffuse.

To explain the effect that the characteristics of glaze slip, that is, viscosity and degree of diffusion, have on the pattern, (1) If the viscosity is low, the molten droplets will easily spread outward, and if the viscosity is high, the molten droplets will drop. Difficult to spread.

(2) If the degree of diffusivity is high, the molten droplet will easily spread outward, and the molten droplet will show a smooth convex state, and if the degree of diffusion is small, the dropped molten droplet will be difficult to spread outward, The melt droplet exhibits a protrusion-like convex state.

The method of controlling the properties of the glaze slip is of particular importance.

The method for controlling the characteristics will be described next.

The viscosity of glaze slips is generally controlled using what are called viscosity modifiers.

The glaze used in the present invention may be any glaze that is generally used for ceramic products.

The glaze is not specified; for example, for relatively low-temperature firing, glaze, lead glaze, boric acid glaze, alkaline glaze, etc. can be used, and for relatively high-temperature firing,
Alkaline lime glaze, lime glaze, lime zinc glaze, lime barium glaze, lime magnesia glaze, talc glaze, feldspar glaze, etc. can be used.

In the present invention, the viscosity modifier may be one commonly used in the glaze industry, including rubber, gelatin, C, M
,C. , PVA, sodium alginate, vegum, plastic clay, acid clay, bentonite and NaCl, Na
CO3, NH, CI, Alc13, CHxCOOH, B
aCl2, CaC12, etc. can be used. Various commonly known surfactants can be used depending on the type and properties of the glaze slip, but higher alcohol sulfates, alkyl sulfonates, alkyl benzene sulfonates, alkyl phosphate ester salts, etc. can be used. Anionic surfactants such as aliphatic amine hydrochloride, aliphatic quaternary ammonium salts, cationic surfactants such as pyridium salts, sulfonium salts, phosphonium salts, amino acid type surfactants, betaine type surfactants, sulfuric acid Amphoteric surfactants such as ester salt type active agents, imidacilline type active agents, phosphate ester salt type active agents, and polyoxyethylene alkyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene glycol fatty acid esters, polyoxyethylene fatty acids Nonionic surfactants such as amitoethyl and polyhydric alcohol fatty acid esters can also be used.

The degree of diffusion is controlled by the viscosity of the glaze slip and the amount of surfactant added. As a result of studies, the present inventor found that the following relationship exists between the viscosity and surfactant of the glaze slip and the degree of diffusion (the magnitude of which is expressed as a diffusion index) in order to obtain a marble pattern. The relationship is shown in FIG. In the figure, η1, η2, and η3 represent the viscosity of the glaze slip, which is η1 × η2 × η3. As can be seen from Figure 3,
Viscosity of glaze slip (η) Addition amount of surfactant (c)
and the diffusion index (a), the following relationship holds true: a=−f (c, η). Here, k is a constant determined depending on the type of surfactant.

The inventor of the present invention investigated the formation of marble patterns by changing the viscosity of the lower glaze and the diffusion index of the upper glaze, and as a result, discovered that a certain limit existed. Table 1 shows the relationship between viscosity, diffusion index, and pattern.

Table 1 Notes, △, 1. Limit condition Oo, good condition (example) -10, poor (no marble pattern was formed) As can be seen from the above table, the viscosity of the lower glaze was 0. The range of 5 to 12 poise is preferable, and the diffusion index of the top glaze is preferably 5 to 90.

The glaze slip for the lower glaze and the glaze slip for the upper glaze thus obtained are sequentially applied to a ceramic base.

At this time, apply the top glaze before the bottom glaze dries.

After glazing, a ceramic product with the desired marble pattern is obtained by firing in a conventional manner.

The glaze does not have to be colored, but either the top or bottom glaze must be colored.

Furthermore, when colored, the colors of J:NJ and the lower glaze do not necessarily need to be different. Further, the types of glazes used for the upper glaze and lower glaze may be the same or different.

[Example] Hereinafter, the present invention will be explained in more detail with reference to Examples. Tables 2 and 3 show the type of substrate, the type of glaze, the viscosity of the lower glaze or upper glaze, and the diffusion index of the upper glaze or lower glaze used in each example.

Table 2 Table 2 (continued) Table 3 Table 3 (continued) Example 1 Gray matte glaze (C.

Adjust the viscosity using M and C to reduce the viscosity to 0. 5 poise). The glaze was applied by pouring it as an underglaze.

Before the glaze dries, a white glossy glaze (diffusion index adjusted to 36 by adding 0.5% by weight of a higher alcohol surfactant) is sprayed onto the glaze to apply the top glaze, and then dried. Afterwards, it was fired in a tunnel kiln at 1100'C for 18 hours to obtain a marble-patterned decorative brick.

Examples 2 to 6 In the same manner as in Example 1, materials and firing temperatures were changed as shown in Tables 2 and 3 to obtain marble-patterned decorative ceramic products of various colors.

[Effects of the Invention] Ceramic products with a stable marble pattern can be obtained without being affected by firing conditions such as firing temperature.

Glazing can be done using conventional processes and equipment, without requiring any particular improvements in process equipment.

[Brief explanation of the drawing]

Fig. 1 is a diagram schematically showing the progress of patterning of the glaze according to the present invention, Fig. 2 is a cross-sectional view of Fig. 1, and Fig. 3 is a diagram showing the diffusion index and FIG. 3 is a diagram showing the relationship with the amount of surfactant added. 1.1. Base material, 219. Lower glaze, 311. Upper molten drop, (a), state immediately after dropping, (b), (c), state where the dropped glaze layer is spreading

Claims (3)

[Claims] (1) After applying a glaze slip containing a viscosity modifier as a lower glaze to the ceramic base, apply a glaze slip with a viscosity modifier of the same or different color as the lower glaze as an upper glaze, before the lower glaze dries. A method for producing a ceramic product having a marble pattern, which comprises applying a glaze on a lower glaze and then firing it, and containing a surfactant in either the upper glaze or the lower glaze. (2) Rubber, gelatin, C.I. M. C. , PVA, sodium alginate, vegum, plastic clay, acid clay, bentonite, and NaCl, Na_2CO_3, NH_4C
l, AlCl_3, CH_3COOH, BaCl_2,
Viscosity modifiers such as CaCl_2 reduce the viscosity from 0.5 to 1.
2. The method of claim 1, using a glaze slip adjusted to 2 poise. (3) As surfactants, anionic surfactants such as higher alcohol sulfates, alkyl sulfonates, alkylbenzene sulfonates, alkyl phosphate ester salts, aliphatic amine hydrochlorides, aliphatic quaternary ammonium salts , cationic surfactants such as pyridium salts, sulfonium salts, and phosphonium salts, amino acid type surfactants, betaine type surfactants, sulfate salt type surfactants, imidazoline type surfactants, and phosphate salt type surfactants. amphoteric surfactant, and polyoxyethylene alkyl ether,
Nonionic surfactants such as polyoxyethylene fatty acid ester, polyoxyethylene glycol fatty acid ester, polyoxyethylene fatty acid amide ether, and polyhydric alcohol fatty acid ester are used, and the diffusion index is 5 to 90.
2. A method according to claim 1, using a glaze slip that is.